Credits never expire.
Every figure above is what the credits can get per feature.
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Credits are non-refundable, and they never expire. Once bought they stay on your account until you spend them, however long that takes.
A credit is site credit for the paid features on playstockfish.com, such as coaching, game analysis and the other tools that use AI. It is not money, has no cash value, and cannot be exchanged for cash.
Credits are sold as digital content that is available immediately, so a purchase is final and is not refundable, whether the credits have been spent or not. If a purchase was charged in error - a double charge, or credits that never arrived - contact us and we will put it right.
Credits do not expire. They stay on your account for as long as the account exists, and they are not reduced by leaving them unused. Deleting your account gives up any credits still on it.
Credits belong to the account that bought them. They cannot be transferred, sold or shared between accounts, and they cannot be reinstated on a new account.
Prices, pack sizes and what each feature costs in credits can change. A change never takes credits off an account you have already paid for - a balance bought at one price stays yours in full.
Payments are taken by Stripe. Card details go straight to Stripe and are never held by this site. Your card statement shows the charge under our Stripe account name.
If a payment has been taken and the credits have not arrived, or anything else about an order looks wrong, use the contact page and we will sort it out.
These credit terms are part of our Terms of Service.
PlayStockfish.com is a free online chess site built and maintained by Edgeway Software, a small independent software studio. The whole site runs in your browser, with nothing to download and nothing to install.
You can play Stockfish at any strength, from gentle beginner bots up to full grandmaster force, or have every move you play graded as you go by our coach, or play Better Move Training, where Stockfish takes back any move that blunders and makes you find a better move. Games you have already finished elsewhere can be pulled in by Chess.com or Lichess username, or pasted as PGN, and reviewed move by move for blunders and missed wins.
There is also an honest estimate of your rating over three calibrated games, tactics puzzles drawn from real play, opening practice, a library of grandmaster games, a plain-English guide to the rules of chess with boards to practise on, and an arena where AI models play each other.
The site runs the unmodified Stockfish 19 engine, compiled to JavaScript and WebAssembly so it plays and analyses entirely inside your browser. It is one of the strongest chess engines in the world, and because it is open source, anyone can use it and learn from it.
Not affiliated with the Stockfish project. PlayStockfish.com is an independent project by Edgeway Software. It is not affiliated with, endorsed by, or connected to the Stockfish project or stockfishchess.org. “Stockfish” is the name of the open-source chess engine developed by the Stockfish developers.
We use the official engine and the Stockfish.js browser build (Stockfish.js 18, lite single-threaded build) exactly as published, with no changes to their source, under the terms of the GNU General Public License v3. The complete source for the build we ship is available from the repositories linked below.
The original Stockfish chess engine (GPLv3)
github.com/official-stockfish/StockfishThe JavaScript and WebAssembly port that lets the engine run in a browser
github.com/nmrugg/stockfish.jsHandles the rules on every board here: move generation, legality and PGN
github.com/jhlywa/chess.js